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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3523ac58c761d53b9b5e1e63941a261240e5b8623051cbb329a3e1d514a29a52' 
  AND token = 'nuN3Iwn7io46wwUksOzXfnFfF8crhRNl+s11hgmLJlk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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