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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fd821895e20f65aaad201d308a561b7939b18fee290f0c52ba1d224097cce81b' 
  AND token = '80CYYgZsEu+lkR5oFEYK1MPefvs1PHphbp3plmtfCE4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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