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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7b9524633caaef959042df36b0245637dc62e3d30ef01e11fbabe28601a1e7a2' 
  AND token = 'bir3fWs1d7e0+0ABANyZbcJiVR5z1eg3YY+dp1pCA/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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