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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '43a0b7d9d8a05a9fa5ab3a815bd82509737e8fb031ad05bceb01f7381fdde3ce' 
  AND token = 's9JBJzO4G1sTIoMdpJ8F9ob3FjVQpPz8nChZK84hJrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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