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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e01feaad320fb715bf55b4a159bf64e0b657bab5d78af98ba5cbd4febc44387c' 
  AND token = 'pnGLZeVPlUSid8ONiWLtCgyCnukfauu3XpHFOmjHMoI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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