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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f7c6475a3118e268a5c6daf582e166d09f37fd0d5803db6f7fbb81e78af1e0a3' 
  AND token = 'cJ/YPl30Cl3q7RCm0y36ANFK0F9CkrsX+0KWEW+XYVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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