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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '262b7073fdc0c1145c81ed594f1968892f9b9174595fa20b10e91eedaab09233' 
  AND token = '3PLEUAkZecu5byinh/PREu0QzrORzeeV2DzepgodsJs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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