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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eac79e0d586ef8859cffe1ac525fb0ab0506b7430f993a13360464320618a2a1' 
  AND token = 'PT05+N4eoX2fuDXXlG56Xd24QmvCsf5Kiv9yQARKSDE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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