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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9a12a2c14d813e0233cff37a1cdb510ff3868665a0a8f02de060066b6d1d310b' 
  AND token = 'Ll8+mRJ8VOpBwWDIc9D5bF2TrSEFiyfVWShYiluX2Ks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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