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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '93af43038950eb868d5142d55f6a937d502100746ec483d6fa173efbc9288c51' 
  AND token = 'F7Baant8vryED+MrYgKREhPiOEAvP3INggArJ1rTwAw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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