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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dc638c435bf47b39896de51b3f54694f4d02f71840e9360696627e390752f6f0' 
  AND token = 'gC1t457rOHXpti6zgSZCAkU4SUDAdW9k9Tov8NDj6h0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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