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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f957831bba5d87fc18b7fd85edd43233c3e38da89287bd4451b41fcec00c8fe3' 
  AND token = 'ss8/1foLpuZDqmutlLzzzqF+UWgIZeFWT7SeDH2bx70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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