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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '41c1b8855846adb42fa927515448f2d962f683927c2be61a615f7b6f0b747b18' 
  AND token = 'sI/DpNAIy7Dn+HupNuHfI9BPT1g9+FeH00ch7peEhec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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