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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '85b837980d9197c6566c39a1ecb815b0af72e162bc2b1d345c9a166b6de11efa' 
  AND token = 'Xr1268+UFTyLP39tn2v4okLagqM2IYVXS0PEeUsfadU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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