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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'adb20a17b911f19c0efae3a6b8a27da5f92240dfd0c3b29c67eff78ef7606dcd' 
  AND token = 'T/U5Pm1Ru6UIebm1TYNuJnihvH4poHvo4Zr1OUTRLnw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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