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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '17b876b603cf6d00c67075e786ef4d3d0171fc2b7221a341b4dd9eb29119ef25' 
  AND token = 'rp8sAycfsE54gfRotRNplXGPpri2wdikWu9DVKJ5gco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}