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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '17fc6066fd4a1a0a460dfc225a78f0ba22a62432a06071a8fbbb8c9e61324078' 
  AND token = 'mwzF82uAyqB3y+gXxAUnGEAhbq4QF1DubsWssKWKndQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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