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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e7ca032b3c7b516ccaa64938a1d86e9dec0b00906438910e50f501ed27cece79' 
  AND token = 'A9Enrr8rd3IgZuT75jmuuYnEWFy2hRheontitYigpoo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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