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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '00a6883ed81827d289c5669a9d174246d4c3acf3a8f210af85d9dce6aeb7c0a0' 
  AND token = 'qa/kbUhHYChPDNF7XtnLMUjOrnFMss2xn53MCssAFSQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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