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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f423a3fbb0d51f18c0650bcae72d30c7c1c23b3104ad21272664446db51536f2' 
  AND token = 'QW+9clsQokZrFf1Ob1AY3m1DEZHCS4lL3MbwZS2rZ4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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