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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b2a6d5a1e632ceeb7079a47181e48651ff2c4209e45f2dad0bfef65fc34bde29' 
  AND token = '2i7l5r2n1mG/S2LCm+6exPbSFsqyxBtWLsvKw6yhauk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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