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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '92ec9ab5bccca89b0fa62d49cff19d3c5787b44de0d42825bfca7de16c1a2b52' 
  AND token = '5AqV/5UYJg/FVk57SYCRfmxvjyB3q4N6d4b/w3yd0Ec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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