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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2a2bfdca3b0cea96ccf72e29aa05af1afc559a1adcc6cccfe0e68e9764b1fc2f' 
  AND token = 'kyYVGJuigNcwnf9+SVP6Ir7BSVetceVSBPg5jSiEqyM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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