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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c3d7a8f3369fd72b3d1cf2bca1b387ce0fcd9a41921f0d20fb5777d63761163c' 
  AND token = 'i7DRGVdOPL9zM7rME+CTnU9ex2tmXYC2PI/bsqLW/kI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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