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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a4e3a23b24b068358b5d3e456c69d5bf91a137ca51bbfe95c6c265ba2fac03fd' 
  AND token = '/jt38QunFAbbqcMr0RIFTpdJBF50FB4qNRuAqDoYaMA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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