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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '89b1115709d43139660a5c5fdac99280fee6c40dca54547cdf158b11aa68ac12' 
  AND token = 'VpWVrU4L21cQIDXAnrMphb0aUnAMNR4y4xzz2QXL9D8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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