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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '13ee855fa3c0423485726948b52ad37dc3bdec2f577ceb181dab819c214d312a' 
  AND token = 'c+7oADCrHUF8izghcDe7goAMJ+E0JkSCZUmxwyMm0vg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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