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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bc73c0e96be37f9f131cb90b71f747f9a1e5e0d82cb646b0886806f9f4d095ab' 
  AND token = 'pVPW7qEEOuLLqd6BX1nf224bkRG52BKurthBRAXZaP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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