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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1f70b9bcaa0bc2f497a51d965c502be6968ab9fd11c55e95e98a72e1fc8f27c9' 
  AND token = '23VbtICtwWwFY+wHEuxcway+gF1woJDVsIM3bF+S1c0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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