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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f234f9aa64787a9fb8ae8d56a24a73c0d28db552229cef74cfa7cc39f4e0808d' 
  AND token = 'm64tisUBXs9vuW5dv5X3/V59Lfr4DjPP8DAdFhZrEQ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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