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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8f5fc2f500d38ec7e31b367b268907d9a7f1352e136075a0a194d692b2172352' 
  AND token = 'MCsO2JLp9BVcvpR8uFk3TMJrfDBs4Z9JXc9aaEa+o6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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