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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '06cd7cc14fcb58ac4c31e017b066f3aaf29d52c037b4af528769b14d48ca573a' 
  AND token = 'wlHIFFy2HQSoL4RupE42rjxxxXyVZ5M6nHkZN7m3Viw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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