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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e8cec3bd4aa8c5b64bc93d0769586ab59cf22e0d627ad88988c9583f89653d66' 
  AND token = 'xOHLRCvmzSq0Off/0jiOSuvcTvcwqcodOa/dF4JZ3/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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