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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd26d9c6983fce598732425c6f0dd2c4b739a693cfeea96f50fbee0eeb04e3f7d' 
  AND token = 'BeUb9J456TX+ni1YKENtP+F5ElC2lLyGpfDTjPUHDMs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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