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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '21f98c6cee7945e68436d18a7e4fa5c1d046f12fa51a23e87e05a406a09b18a7' 
  AND token = 'bABNV8udRBWBzUf78WlpfkY5hpTLC8rrNzaCdqVxkHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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