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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e9fa1c4eba82a22da53d02e50ff4a6edc3ceda55422080f48ffb8dcfbafbbb73' 
  AND token = 'VFu+RMS9lq4O+35apic2jm14HvwmUeSZZhEOy+7OSqI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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