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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '974e3cd09d89fcf79db83d1edc985c1380177fed3d42443c12438a1421d0afbf' 
  AND token = 'QPf/aJ3y8FjlItlVIiCiuR4zxC2OgiK3aARnKxqdl/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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