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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'be7d20a0716244d2bbb828165d1f16f6ad6ff68b7520aa07323d535a47f42c95' 
  AND token = '3UyMPZuRzHW0eGR+dlikUFmLLNe7Ei5rpQTXJSE+33Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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