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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '22ca87575d8e8c3fa132e25e5e047be5ef5e3f57df4c2402b9d6f5687e8fa02f' 
  AND token = '+zav9kuhOL2dAYBqL9Lr4BNtcFUj6m2m9zmhHSGEbuA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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