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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b3db77bdf593f686eb721797be00c8fef9a8a5662ad44a3077a20e4b9974728a' 
  AND token = 'TPSLWGj261F8iG4n+dCKe/q0j1j/hoForMYktO7WPQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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