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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5fe654926a63d06c629e86ba207046c10a7fb63f5344ad2f3241d52e219016a4' 
  AND token = 'xKf/Y7BDec5auTeptxN2TRIFsdB81XsvxCrC1yi5Msk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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