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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9cb2972aae67452dd83effe469b7949da09b09c32764d7c37504d7e3e7b9ad7d' 
  AND token = 'EyrTeiQYQA6C16gPPm2ieQK7HAy8vSOqbnP+gv4m4XY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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