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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e73a17aaa728a40c8a585ec3645effeed7da436f1144f4739dd0ceef38b18e8d' 
  AND token = '4G8KmgwCvAZSDk4UYrbELTYmR+yUjam00O5Kh9bS0rQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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