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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '38cf4f1ae392b2e190a31e81734abf1bfcc9a6fa85e3396a3a992ca51be3c4af' 
  AND token = 'CtbaLgjPc7NJO5l7oeTgw1GoU0yCANq/MvkFvtlPa5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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