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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '18373acc02ea3e05d3c950083e17560cbe9ccf57c89021ae3006ffc7dfed8572' 
  AND token = 'Z751ANcZ8KVNapfe6d0FDaNx/ZLAhUjiEe035oBpVeY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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