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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '891d34080bd2dc559c0afb54e818703b978ddc4d3eb20565dfa1e56ce69df604' 
  AND token = 'AyeEzJs7SRhq9kFm5Ude0OuwFPTtmR4vlJA342n6Uno=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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