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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0bfd5db0fba4d62b48d0b54d5684ff88fc0f5d0c3b5a0a39ba578abeb230ccbc' 
  AND token = '3IaZv48YVnxmvIx7XutGnbJyJoWM4MetVfpjb313tsQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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