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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '58fa9e1e11ca7a2cdf66ed7db2cf026416748a2402b6102f2ed886a62fd85eb5' 
  AND token = 'YdZPYPtg51Kny4abHMIgVXL4a1QvrKVwVw8yQ9cEK18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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