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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9d0f1d3b12129f976950f898c0c4f4162830570b02acdd91eb090856d85e9d40' 
  AND token = 'hOUJojmFuHeyEcNAbMHrmHGswDNto7olDoY503ZzaFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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