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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c58aa2fb9fd6be35bcd63b36768883c3b276aea159f25bfb1d3daf7dab8d5108' 
  AND token = 'fdSvON4AyAVfEAVtqhBr72AwwKMqNLH+RJSqucR4DCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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