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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4e878df69f34c18505c9b46649f55a0f0e76bd4e0e28afa7536d8f3d6a602939' 
  AND token = 'to8SDqExHjBtLzP0o779Q0Ybmh1h5JTntTj1DURFEv8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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