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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '48d8cb8165cc8f7a1596794b7a27c50699f40c5f4a78975486e75daa69cec0a3' 
  AND token = 'mTXRVuWTxG1PR1E7C0c6Wxmb5IScKnYRd8DCkNjGJGc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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