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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '20940058b53daf17d081e6e6d858da58c5872e13bad87feefbd15dd0078e2ee7' 
  AND token = 'cpXB+8jVc2CgGoffo29Hq4tSdTBXAFUkv7huwCrONU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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