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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aaf52674ea71a726819034185b3b835c3f3e718ce6d2e7d3edc4aea4e1c7984a' 
  AND token = 'g33IiN3/CAVd7YsZHAjPR424dwCijdlv55yTE7lAbZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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