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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a1e2856e4dfd459e80443b4d934aa7d018bbb5f71a35845280d3b68279955fa2' 
  AND token = 'IkZuAcRsRiQ3Snw2MEGFp0U5dOZci2XqF6dSSV00cjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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