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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e45bd050b008e320031758124adf23266cb997ebeac930bf434ab4651db9c7e8' 
  AND token = '4r+R1rj0rQCOWeGHnMcT2n+f7oQ5DiYGKW1JtcsOd94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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