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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aca5ad52226095a069831d940ed11e2306f26763afcff85931555ebfbea38539' 
  AND token = '7pW1S6vhVjSJsf4wsLO35jtoyeklOcSJ6f3JOrEuYeA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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